Adaptive Clock Frequency Control for Fast Timing Margin Response
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Solution Overview
Problem
Integrated circuits face challenges in quickly responding to marginal operating conditions, leading to potential timing violations and increased power consumption due to slow adjustments in clock frequency and supply voltage.
Innovation Solution
Implementing adaptive frequency control through a clock divider and phase stretcher to dynamically adjust the clock frequency by gating and stretching clock cycles, allowing for quicker responses to operating conditions without altering the supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If adaptive voltage scaling is used to minimize supply voltage for power reduction, then power consumption is reduced, but the response time to adjust voltage becomes slow (hundreds of microseconds)
Solution Approach 1:
The system dynamically adjusts clock frequency in real-time based on monitored operating conditions (temperature, voltage, process variations). The clock frequency can be quickly changed by gating clock cycles and stretching periods, allowing the system to adapt to changing conditions without the slow response inherent in voltage adjustment alone.
Solution Approach 2:
The patent changes the clock frequency parameter dynamically by selectively gating clock cycles and stretching their periods. This allows the system to operate at lower frequencies when conditions permit, reducing power consumption while maintaining safety margins, without being constrained by slow voltage adjustment response times.
2Reliability
If a significant voltage margin is maintained to ensure timing requirements are satisfied under all conditions, then reliability is improved, but power consumption increases
Solution Approach 1:
The system continuously monitors operating conditions including temperature, voltage, and process variations. Based on this feedback, it dynamically adjusts the clock frequency to maintain timing requirements while minimizing the voltage margin needed, thereby reducing power consumption while preserving reliability.
Solution Approach 2:
Instead of maintaining a static voltage margin for all conditions, the system dynamically adjusts clock frequency based on real-time monitoring of operating conditions. This allows the system to operate closer to timing limits when conditions permit, reducing the conservative voltage margin and associated power consumption while maintaining reliability.
3Speed
If clock frequency is quickly adjusted by changing input clock frequency, then response time is reduced, but the adjustment mechanism becomes complex and slow (hundreds of microseconds)
Solution Approach 1:
The system segments the clock signal into individual cycles and selectively gates them. Instead of changing the overall input clock frequency through complex mechanisms, it processes clock cycles individually or in groups, allowing quick frequency adjustment by simply enabling or disabling specific cycles and stretching their periods.
Solution Approach 2:
The patent introduces a clock cycle gating mechanism as an intermediary between the input clock signal and the output clock signal. This intermediary selectively passes or blocks clock cycles and stretches their periods, providing a simple yet effective way to quickly adjust output frequency without complex frequency synthesis circuits.
Data Source
AI summary
This document describes systems and techniques for adaptive frequency control in integrated circuits. In response to operating conditions that permit a lower frequency of a clock signal, the described systems and techniques dynamically reduce the clock frequency without adjusting the frequency of an input clock signal. The clock frequency is decreased by gating a fraction of the input clock signal and stretching the ungated cycles by an offset amount. By dynamically adjusting the clock frequency in this manner, an integrated circuit can change its clock frequency more quickly and maintain the supply voltage closer to a lower voltage limit to reduce power consumption and allow safer operations.